K value refers to the voltage drop of the battery in unit time, usually expressed in mV/d, and is an indicator to measure the self discharge rate of lithium battery. OCV1 is measured at time t1. Measure OCV2 at time t2. K=(OCV1-OCV2)/(t2-t1)。 The K value of the battery with good performance is generally less than 2mV/d or 0.08mV/h.
The capacity (K or C value) of a battery depends on the current with which it's discharged. The lower the discharge current, i.e. the longer the discharge time, the greater the usable capacity. And vice versa, the greater the discharge current, the less the available capacity. The “K or C” index always indicates the discharge time in hours.
It is primarily attributed to irreversible chemical reactions occurring within the battery. The “ K-value” is a crucial parameter used to quantify the self-discharge rate of a lithium-ion battery. It represents the voltage drop per unit of time under specific conditions (e.g., high temperature or room temperature).
The first important parameters are the voltage and capacity ratings of the battery. Every battery comes with a certain voltage and capacity rating. As briefly discussed earlier, there are cells inside each battery that form the voltage level, and that battery rated voltage is the nominal voltage at which the battery is supposed to operate.
This post is a summary of the PV solar cell glass price developments. The price developments of PV solar cell glass are expressed in US$ prices converted FX rates applicable at the time when the price was valid. PV solar cell glass price index developments are calculated from multiple separate sources of data to ensure statistical accuracy.
Image © Mordor Intelligence. Reuse requires attribution under CC BY 4.0. The solar photovoltaic glass market size reached 32.10 million tons in 2025 and is forecast to reach 74.75 million tons by 2030, advancing at an 18.42% CAGR between 2025 and 2030.
By manufacturing process, float lines delivered 68% of 2024 volume; rolled glass is forecast to post a 19.70% CAGR to 2030. By solar technology, crystalline silicon held 91% share of the solar photovoltaic glass market size in 2024, whereas CIGS cells are expected to grow at 23.61% CAGR between 2025 and 2030.
Government rules that are favorable to the development of solar PV plants is one of the factors driving the growth of the solar PV glass market. Additionally, the market for solar PV glass is growing due to the surge in demand for solar systems on a residential, commercial, and utility scale.
Given the right energy management solutions, bidirectional charging, or V2X, could add significant storage capacity for these systems. In addition, pairing a V2X system with stationary batteries can improve overall system efficiency and provide a more seamless transition of the home to backup mode.
Bidirectional charging allows an electric vehicle to both charge its battery from the electrical grid and discharge energy back to the grid or another electrical system. This capability will not only enable emergency backup power for homes and businesses but also allow users to alleviate grid strain and reduce energy costs.
Bidirectional chargers convert AC (alternating current) from the grid into the high-voltage DC (direct current) needed to charge an EV. When discharging, they reverse the process, sending energy back as usable AC power - similar to how batteries like the Tesla Powerwall work. ▶️ MORE: Watt is Bidirectional Charging, V2G, V2H, V2L?
Unlike conventional chargers that only pull power from the grid to charge a vehicle, bidirectional EV chargers allow electricity to flow both ways. This means an EV battery can store energy and return it when needed. Here's how it works: Vehicle-to-Grid (V2G): EVs can return energy to the grid during peak demand, helping stabilise the power system.
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